What Is an Annuity and How Does It Work?

Annuities get pitched hard by financial salespeople and criticized just as loudly by financial commentators, which leaves most people confused about what they actually are. Strip away the sales pressure and the criticism, and an annuity is simply a contract with an insurance company designed to turn a sum of money into a stream of guaranteed income.

Finch & Fortune shares general educational information, not financial advice. Everyone's situation is different — consider speaking with a qualified financial professional before making major money decisions.

What is an annuity?

An annuity is a contract between you and an insurance company. You pay the insurer a lump sum or a series of payments, and in exchange, the insurer agrees to pay you income — either starting right away or at a future date you choose, and either for a set number of years or for the rest of your life.

The basic appeal is guaranteed income: unlike a stock portfolio, which can lose value, an annuity's income payments (once locked in) are backed by the issuing insurance company's guarantee, not market performance. That guarantee is also the source of most annuity criticism, since guarantees typically come with fees, surrender periods, and lower growth potential than investing the same money directly in the market.

How an annuity actually works

1. You fund it. You pay into the annuity either as a single lump sum (a single-premium annuity) or through a series of payments over time (a flexible-premium annuity).

2. It grows (in some types). Depending on the annuity type, your money may earn a fixed interest rate, grow based on an underlying index's performance, or be invested in mutual-fund-like subaccounts, during what's called the accumulation phase.

3. It pays out. At the point you choose — either immediately or years later — the annuity converts into income payments, during what's called the payout or annuitization phase. Payments can be structured to last a fixed number of years or for the rest of your life (and optionally a spouse's life too).

4. The insurer bears the longevity risk. This is the core trade you're making: in exchange for giving the insurer your money and accepting its fees and terms, the insurer takes on the risk that you'll live longer than expected and need income for more years than a typical retirement account might safely support.

The main types of annuities

Fixed annuity. Pays a guaranteed, fixed interest rate for a set period, similar in concept to a CD but issued by an insurance company rather than a bank. Predictable, but growth potential is limited and generally trails inflation over long periods.

Variable annuity. Your money is invested in subaccounts similar to mutual funds, so growth (and risk) depends on market performance. These typically carry higher fees than fixed annuities, including mortality and expense charges layered on top of the underlying fund fees.

Indexed annuity. Returns are tied to the performance of a market index (like the S&P 500), usually with both a cap on maximum gains and a floor protecting against losses. This "some upside, limited downside" structure is often the selling point, but the caps, participation rates, and fees vary widely and need to be read carefully.

Immediate annuity. You pay a lump sum and income payments begin almost right away, typically within a year. Common for retirees converting a portion of savings into guaranteed income at the start of retirement.

Deferred annuity. Income payments don't begin until a future date you specify, sometimes many years out, allowing the money to grow during the accumulation phase first.

The real costs and trade-offs

Fees can be substantial. Variable annuities in particular often carry annual fees between 2% and 4% once you add mortality and expense charges, fund management fees, and optional rider costs — meaningfully higher than a typical low-cost index fund.

Surrender periods lock up your money. Most annuities have a surrender period, often 6-10 years, during which withdrawing more than a small penalty-free amount triggers a surrender charge that can run as high as 7-10% in early years.

Early withdrawal penalties apply too. Like retirement accounts, annuities generally carry a 10% IRS penalty on earnings withdrawn before age 59½, on top of any insurer surrender charge.

Guarantees are only as strong as the insurer. Annuity guarantees aren't backed by the federal government the way FDIC-insured bank deposits are. They rely on the financial strength of the issuing insurance company, which is worth researching (via independent ratings agencies) before committing significant money.

Who might consider an annuity

Annuities tend to make the most sense for people who are risk-averse, already maxing out tax-advantaged retirement accounts, and specifically want guaranteed income they can't outlive — often retirees converting part of a portfolio into a income floor to cover essential expenses. They're generally not designed to be a primary growth vehicle for younger savers with a long time horizon, since the fees and lower growth potential compete poorly against a diversified low-cost investment portfolio over decades.

The takeaway

An annuity is fundamentally a trade: you give an insurance company your money and accept its fees and terms, and in return you get a guarantee of income that a market-based portfolio can't promise. That trade makes sense for some people in some situations, particularly those prioritizing guaranteed retirement income over maximum growth, but it's not a universal answer — and the fee structures and surrender terms vary enormously between products. Reading the actual contract, not just the sales pitch, is essential before committing.

Frequently asked questions

Are annuities a good investment?
It depends on the goal. As a growth investment, annuities often underperform a diversified low-cost portfolio due to fees. As a source of guaranteed retirement income, they can fill a role that a market-based portfolio can't — the two goals aren't really comparable head-to-head.

Can I lose money in an annuity?
It depends on the type. Fixed annuities generally protect principal. Variable annuities can lose value if the underlying investments perform poorly. Indexed annuities typically have a floor that limits losses but doesn't always guarantee zero loss, depending on the specific product.

How is annuity income taxed?
Payments from a non-qualified annuity (funded with after-tax money) are partially taxed as growth and partially treated as a tax-free return of your original principal. Annuities held inside a qualified retirement account (like an IRA) are taxed as ordinary income when withdrawn, similar to other retirement account distributions.

What happens to an annuity if I die?
It depends on the payout option chosen. Some annuities include a death benefit that pays remaining value to a beneficiary; others (particularly lifetime-income options without a beneficiary rider) may stop payments entirely at death, with no remaining balance passed on. This is a key detail to review before purchasing.

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Further reading & trusted sources

• CFPB: free consumer money tools
• MyMoney.gov: the U.S. government financial education hub